linux-kernel - Re: [PATCH 3/3] usb: dwc3: keystone: Turn on USB3 PHY before controller

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Message-ID: <debe1c1d-8e84-8047-d387-42d4f6e03f91@ti.com>
Date:   Mon, 25 May 2020 09:39:18 +0300
From:   Roger Quadros <rogerq@...com>
To:     Felipe Balbi <balbi@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     <robh+dt@...nel.org>, <vigneshr@...com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] usb: dwc3: keystone: Turn on USB3 PHY before
 controller

Felipe,

On 14/05/2020 13:21, Felipe Balbi wrote:
> Roger Quadros <rogerq@...com> writes:
> 
>> On 14/05/2020 04:37, Chunfeng Yun wrote:
>>> On Wed, 2020-05-13 at 16:07 +0300, Roger Quadros wrote:
>>>> The Local Power Sleep Controller (LPSC) dependency on AM65
>>>> requires SERDES0 to be powered on before USB.
>>>>
>>>> We need to power up SERDES0 power domain and hold it on
>>>> throughout the reset, init, power on sequence.
>>>>
>>>> Signed-off-by: Roger Quadros <rogerq@...com>
>>>> ---
>>>>    drivers/usb/dwc3/dwc3-keystone.c | 47 +++++++++++++++++++++++++++++++-
>>>>    1 file changed, 46 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
>>>> index 1e14a6f4884b..46d46f3507fc 100644
>>>> --- a/drivers/usb/dwc3/dwc3-keystone.c
>>>> +++ b/drivers/usb/dwc3/dwc3-keystone.c
>>>> @@ -14,6 +14,7 @@
>>>>    #include <linux/dma-mapping.h>
>>>>    #include <linux/io.h>
>>>>    #include <linux/of_platform.h>
>>>> +#include <linux/phy/phy.h>
>>>>    #include <linux/pm_runtime.h>
>>>>    
>>>>    /* USBSS register offsets */
>>>> @@ -34,6 +35,7 @@
>>>>    struct dwc3_keystone {
>>>>    	struct device			*dev;
>>>>    	void __iomem			*usbss;
>>>> +	struct phy			*usb3_phy;
>>>>    };
>>>>    
>>>>    static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
>>>> @@ -95,8 +97,44 @@ static int kdwc3_probe(struct platform_device *pdev)
>>>>    	if (IS_ERR(kdwc->usbss))
>>>>    		return PTR_ERR(kdwc->usbss);
>>>>    
>>>> -	pm_runtime_enable(kdwc->dev);
>>>> +	/* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
>>>> +	kdwc->usb3_phy = devm_phy_get(dev, "usb3-phy");
>>> Use devm_phy_optional_get() instead?
>>
>> Indeed, it seems better suited.
> 
> patches 1 and 2 are in testing/next
> 

Could you please drop them as I need to make changes to make the PHY optional.
I will send v2 of entire series.

cheers,
-roger
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